例如,我正在使用Archiver:
archive.on('error', err => {
if (typeof callback === 'function') {
callback.call(this, err);
} else {
throw err;
}
});
根据玩笑,发现了这些线。您如何发出此错误?模拟吗
最佳答案
您可以将回调移动到其他模块,然后将其导出,例如:
//calbacks.js
const errorCallback = callback => err => {
if (typeof callback === 'function') {
callback.call(this, err);
} else {
throw err;
}
}
export {errorCallback} // es6 named export
然后,您可以将其导入到主文件中:
import { errorCallback } from "./callbacks.js" //path should be correct, this would work if you have both files in same directory
...
archive.on('error', errorCallback(callback)) //pass callback to curried function
您也可以将其导入
spec
并进行测试:const spy = jest.fn()
errorCallback(fn)("error")
expect(spy).toBeCalledWith("error");
并测试回调不起作用时的情况:
expect(() => {
errorCallback("notFunction")("error")
}).toThrow()
关于node.js - 如何在玩笑和 typescript 中发出错误事件,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/53854097/